if(m-1)(1-k)=0,which of the following can be true?sat数学题

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if(m-1)(1-k)=0,which of the following can be true?sat数学题
if(m-1)(1-k)=0,which of the following can be true?
1.m=1
2.k=1
3.m=k
2 3 都可以,3为什么可以?想不通

问题是说三个答案中哪个可能是对的.
因为可以m=k=1,故3是应该选的.

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